Message-Id: <200111292257.fATMv9q00092@picard.cs.ohiou.edu> From: "Shawn Ostermann" <ostermann@cs.ohiou.edu> Subject: Re: tcptrace questions Date: Thu, 29 Nov 2001 17:57:09 -0500
> 1)I use tcptrace to view test results to measure tcp performance on
> 'ad hoc' wireless network IEEE802.11 based. I use also tcpdump (to
> dump packet) and DBS (to generate TCP traffic). As result I can see
> al lot of HD (Hardware duplicate) but I don't understand what's mean
> this HD. I've already read the FAQ but I haven't any help.
HD is an indication that tcptrace thinks it is seeing a "Hardware
Duplicate". That means that it saw exactly the same frame twice and
it assumes that it was duplicated by the hardware or appeared twice on
the wire due to bad routing. I'm not sure which of those might be the
case for you.
If it's annoying, you can disable the warnings with:
--nocheck_hwdups DON'T check for 'hardware' dups
Of course, if they're really there, they will throw off some of the
analysis because they'll count as retranmissions then.
> 2)I'd like to remove the arrows in time sequence graph (tsg). What
> must I do?
I'm not sure exactly what you mean by the "arrows". However, those
are just text files, so can easily be edited by hand. Take a look,
Tim's input format for xplot is very readable. If you're just Talking
about the arrowheads, you might try something like:
egrep -v '^[ud]arrow' b2a_tsg.xpl > new_tsg.xpl
> 3)What's mean the yellow line in time sequence graph? Is it the
> advertise window at receiver? If yes, how can I measure it if on the
> Y axis there are the packet number sequence?
That's the advertised window in terms of sequence number. The
difference between the green line (ACK) and yellow line (RWIN) will
be the numeric advertisement from the packet (32k for example).
> The official web site (www.tcptrace.org) is not very helpfull for
> me.
I apologize for that. I'll forward your comments to the folks who
maintain that thing. We're going to do some more cleanup after the
first of the year.
--sdo
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Dr. Shawn Ostermann - Associate Professor - Ohio University
322B Stocker Center, Ohio University, Athens, Ohio 45701-2979
ostermann@cs.ohiou.edu -- FAX: (740)593-0007 -- Voice: (740)593-1234
http://ace.cs.ohiou.edu/~osterman http://irg.cs.ohiou.edu
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